Stress-head construction



Aug. 27, 1929. A.'E. L. CHORLTON STRESS HEAD CONSTRUCTION 2 Sheets-Sheet 1 Filed March 21, 1928 INVENTOR I A.E.L.chor"'on I BY WITNESSES ATTORNEY along line iv iv of Patented Aug. 27, 1929.

UNITED STATES ALAN ERNEST LEOFRIC CI-IOBLTON, OF LONDON, ENGLAND.

STRESS-HEAD CONSTRUCTION.

Application filed March 21, 1928. Serial No. 263,416.

In my application Serial No. 10,926, filed July 1, 1925, I have disclosed and claimed a single casting for supportingthe cylinders, pistons, and the crank shaft of an internal combustion engine, the casting including side plates, transverse plates, joining the side plates, a top plate joined to the side and transverse plates, and intermediate plates spaced from and substantially parallel to the top plate and joined to the side and transverse plates. The side and transverse plates define a plurality of cells arranged side-byside, the outer ends of the-cells being covered by the top plate and each cell being interrupted intern'iediately by one of the intermediate plates. The top and intermediate plates are provided with alined openings for each cell for the reception of cylinder liners; and, after the liners are in place, the cellular spaces or chambers defined by the liners and by the top, side, transverse, and intermediate plates are used for the reception of cooling medium. The transverse plates are provided with reenforced arch constructions integral therewith for supporting the crank shaft while the cylinder heads are secured in place with respect to the top plate. Inother words, in the application aforesaid, I have disclosed and claimed an engine frame construction which is strong and light, which is highly resistant to torsion, to deflection in all directions, and to deformation due to working forces. The material is so disposed that the walls are quite thin yet structurally strong. As the force of each working stroke is imposed on the cylinder head, such working force is transmitted to the frame by the head bolts. Hence, it is the object of my present invention to reenforce those parts or regions of the frame where such bolts are connected. This and other objects are effected by my invention as will be apparent from the following description and claims taken in connection'with the accompanying drawings, forming part of this application, in which:

Fig. 1 is a plan view of my improved en-' gine frame;

Fig. 2 is a vertical transverse sectional view of the frame taken on the line 11-11 of Fig. 1;

Fig. 3 is a detail view taken along the line IIIIII of Fig. 2;

Fig. 4 is a fragmentar detail section taken ig. 1; and

Fig. 5 shows a modified form of' frame corner reinforcement.

Referring to the drawings more in detail, in Figs. 1 and 2, I show a unitary or integral frame, preferably cast, made up of side plates 10, transverse plates 11, joined to the side plates, a top plate 12 joined to the side and transverse plates, and web or intermediate plate members 13 substantially parallel to the top plate 12 and joined to the side and transverse plates.

The top plate 12 and the web or intermediate plates 13 have alined circular openings 14; and 15, respectively, for the reception of cylinder liners, not shown. As may be seen from Fig. 2, each transverse plate 11 has supporting means 16 for a crank shaft bearing, the lower portions of the transverse plates constituting arch bars, as more specifically referred to in the application aforesaid, for supporting the crank shaft and being integral with the side plates 10 the latter being modified to provide prolongations 17 serving as feet for securing the engine to a base member or foundation.

As shown fragmentarily in dotted lines in Fig. 2, heads 18 are provided, these heads being held down by bolts 19, the lower ends of which are anchored to the top plate 12, openings 20 being provided in the top plate for the bolts. As the reaction of each working stroke is transmitted by the hold-down bolts 19 to the top plate 12, the latter should be reenforced in the regions of the openings. Hence, I show bosses 21 in the upper corner regions of the side, transverse and top plates, the hold-down bolt openings being within the confines of the bosses. In order to avoid bulky or massive bosses and to secure sounder metal I show, in Fig. 4, the bosses 21 consisting of blocks of metal integral with the top, transverse, and side plates, core spaces 22 being preferably left underneath the top plate 12 and between the body portions of the bosses and the transverse partitions 11 to facilitate the casting process and to provide sounder metal. The bosses have bottom faces 23 as shown in Fig. 2; and, extending below such faces, are webs 24: and 25 integral, respectively, with the side plates 10 and the transverse plates 11. Each of the bosses 21 is provided with a hold-down bolt opening 20 which extends through the top plate. In casting, should the bosses exten into the liner space, they may be bored corner formed" by these members, I provide a gusset flange member 28 spaced below the top plate 12 a short distance and integral with the side and transverse plates 10 and 11, respectively. Webs 29 and 30, integral with the side plate 10 and the transverse plates 11, respectively, and with the top plate 12 and the flange member 28, extend between the top plate 12. and the flange member 28.- In this way, there is provided a reinforced construction having openings 31 and 32 for head holddown bolts.

While I have shown my invention in but one form, it will be obvious to those skilled in the art it-is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is 1. The combination with a unitary engine frame including side plates joined by transverse plates to provide cellular spaces ar- 35 ranged side-by-side and a top plate joined to the side and transverse plates, the top plate having a cylinder-receiving opening for each cellular space, of reinforcing bosses joined to the side, transverse, and top plates and located in the corners provided by the latter and said bosses and top plate having openings therein for cylinder head hold-down bolts.

2. .The combination with a unitary engine frame including side plates joined by transverse plates to provide cellular spaces arranged side-by-side and a top plate joined to the side and transverse plates, the top plate having a cylinder-receiving opening for each cellular space, of reinforcing bosses oined to the side, transverse, and top plates and located in the corners provided by the latter, said bosses having arcuate faces alined with said openings and said top plate and bosses having openings extending therethrough for cylinder head hold-down bolts.

3. The combination with a cast engine frame including side plates connected by tegral' transverse plates to provide cellular spaces arranged side-by-side and a top plate integral withthe side and transverse plates, the top plate having a cylinder-receiving opening for each cellular space, of reinforcing bosses integral with the side, transverse and top plates and located in the corners provided by the latter and extending to said openings and said top plate and bosses having openings therein for cylinderhead hold-down bolts.

In testimony whereof, I have hereunto subscribed my name this twenty-fourth day of February, 1928.

ALAN ERNEST LEOFRIC CHORLTON. 

